Replies

  • searching for a cheap drive, I tried the 2822-1200 on 3S and found with cheap plastic, non-nylon, GWS-style china props:

    11x4.5 produces 11 ounces of thrust at 4 amps,

    11x4.5 produces 21 ounces of thrust at 10 amps, (get hot)

    10x4,5 produce 10% less thrust at the same amperes.

    I am very content with the results. Consider slower turning props will result in a less stiff control behaviour.

    Greetings, Hans-Jochen

  • For the 880kv motors 12.4.5 is the recommended size. Not only that, it also has the most disk area and thus, the disk loading factor I spoke about earlier is lower.

    This gets you back into the right hardware for heavy lift/long endurance with the 2each  5800mah batteries.

     

    As a personal note, I think a hexa is a better configuration than your Y from stability, but it should work from a lift perspective relatively the same. You're just going to have to play around as you really haven't stated your goals or payload.

  • Ok, so just a thought, 6 motors drawing let's say 18 amps each is 6x18=108 Amps, now unless you have one heck of a battery, even a 3000mah rated pack with 30C is only 90amps meaning you're killing your pack or must have good 4000-5000mah pack rated still a 25-30C. So that could be one problem (BTW, most battery connectors aren't rated for 100+amps).

    Problem #2 is that you are using 1200kv motors when you should be using something less than 900kv  (spec motors are 850 or 880kv )so you have quite a mismatch of propellor load. Basically you have very high rpm motors trying to drive props intended to spin slow and move lots of air. This means your motor will draw max amps, not reach the intended rpm range and further, your battery and wiring may not be up to the task you have presented. You either need props with less pitch (like a 3 or 3.5) or less diameter (may 8 or 6 inch) to match the motors. Both of those are less than optimal again because you chose less than optimal motors.

    Sorry for your bad luck but you made some wrong choices in hardware.

This reply was deleted.

Activity

DIY Robocars via Twitter
RT @a1k0n: @DanielChiaJH @diyrobocars @circuitlaunch Here's my car's view of that race. About 8.4 second lap times for laps 2 and 3... both…
12 hours ago
DIY Robocars via Twitter
RT @DanielChiaJH: Great racing against @a1k0n today at @diyrobocars! Pretty cool to both break sun-9s at the track today I think I got very…
Sunday
DIY Robocars via Twitter
Broadcasting the @circuitlaunch race live now at https://m.twitch.tv/diyrobocars Races begin around 2:00pm PT
Saturday
DIY Robocars via Twitter
RT @a1k0n: ran a huge number of hyperparameter tuning experiments yesterday; now I can train a new policy, far with better quality, in 15 m…
Saturday
DIY Robocars via Twitter
RT @a1k0n: Did I get rid of hand-tuned parameters? Yes. Am I still hand-tuning more parameters? Also yes. I have a few knobs to address the…
Sep 26
DIY Robocars via Twitter
RT @a1k0n: I'm not going to spoil it, but (after charging the battery) this works way better than it has any right to. The car is now faste…
Sep 26
DIY Robocars via Twitter
RT @a1k0n: Decided to just see what happens if I run the sim-trained neural net on the car, with some safety rails around max throttle slew…
Sep 26
DIY Robocars via Twitter
Sep 24
DIY Robocars via Twitter
RT @SmallpixelCar: @a1k0n @diyrobocars I learned from this. This is my speed profile. Looks like I am too conservative on the right side of…
Sep 24
DIY Robocars via Twitter
RT @a1k0n: @SmallpixelCar @diyrobocars Dot color is speed; brighter is faster. Yeah, it has less room to explore in the tighter part, and t…
Sep 24
DIY Robocars via Twitter
RT @a1k0n: I'm gonna try to do proper offline reinforcement learning for @diyrobocars and throw away all my manual parameter tuning for the…
Sep 23
DIY Robocars via Twitter
RT @circuitlaunch: DIY Robocars & Brazilian BBQ - Sat 10/1. Our track combines hairpin curves with an intersection for max danger. Take tha…
Sep 22
DIY Robocars via Twitter
RT @SmallpixelCar: Had an great test today on @RAMS_RC_Club track. However the car starts to drift at 40mph. Some experts recommended to ch…
Sep 11
DIY Robocars via Twitter
RT @gclue_akira: 世界最速 チームtamiyaのaiカー https://t.co/1Qq2zOeftG
Sep 10
DIY Robocars via Twitter
RT @DanielChiaJH: Always a good time working on my @diyrobocars car at @circuitlaunch. Still got some work to do if I’m to beat @a1k0n howe…
Sep 10
DIY Robocars via Twitter
RT @SmallpixelCar: My new speed profile for @RAMS_RC_Club track https://t.co/RtLb7TcgIJ
Sep 10
More…